In this term, we learned population distribution, climate change, and waste. In population distribution, I was surprised that only 20% of the earth is a place where people can live. The population distribution is not hard to understand. The climate change is the most interested part in this term. Also it is easy to understand, because it is a big problem all over the world, so I already knew about the climate change. When I learned about waste, I realized that the seriousness of waste in daily life. Also, I was not boring to learn about waste. These topics are very big issues nowadays. I have ever heard about these topics, so it is not difficult to understand for me.